<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>圆形</title>
		<style type="text/css">
			div{
				width:200px;
				height:200px;
				background-color:cadetblue;
				border-radius:50%;
			}
		</style>
	</head>
	<body>
		<div></div>
	</body>
</html>
